Django form wizard multiple file uploads problem

[Deniz Bazan]

I have a problem with form wizard, I have a form wizard with 3 steps. 

In step 2, user uploaded several files. In step 3, send the data to the database.

I can save files in server in step 2, but if user does not finish the form then files will remain on the server for free.Therefore I should not save files in step 2 but at done ()

Unfortunately I cannot reach all files in done () method.

How can I solve it, you have a solution for it.